Filamentous Green Algae

Threadlike filamentous green algae growing in the shallows of Copley Retention Dam. These soft strands consist of a chain of cells, giving a thread-like appearance. Oxygen production as a by-product of underwater photosynthesis creates buoyancy, causing the strands to incline toward the surface.

Filamentous green algae from Copley Retention Dam. Magnification 20x.
Oxygen bubbles generated by filamentous green algae.

For more information on the fascinating world of algae, see the report Field guide to algae and other “scums in ponds, lakes, streams and rivers by Miriam Steinitz Kanna and Nicole Lenca of Northern Kentucky University.